misc: xilinx_sdfec: add compat_ptr_ioctl()

Driver has a trivial helper function to convert
the pointer argument and then call the native ioctl handler.
But now we have a generic implementation for that, so we can use it.

Signed-off-by: Harshal Chaudhari <harshalchau04@gmail.com>
Link: https://lore.kernel.org/r/20201026155801.16053-1-harshalchau04@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>